Sponge



FIG. 1 is a left side perspective view of a sponge showing my new design, the right side perspective view being a mirror image thereof;

FIG. 2 is another left side perspective view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side view thereof, the right side being a mirror image thereof; and,

FIG. 6 is a right side perspective view thereof, the left side perspective view being a mirror image thereof.

The bottom is flat and unornamented. 

The ornamental design for a sponge, as shown and described. 